The gas master valve is a switch to control the whole natural gas pipeline, which can control whether natural gas flows into your home. Normally, if natural gas is not needed, the main gas valve should be closed to ensure safety.
The gas stove valve is a switch to control the gas stove, which is responsible for controlling whether the gas flows to the gas stove. If you need to use a gas stove, please open the gas stove valve to ensure that natural gas can be used normally.
Usually it is closed horizontally and opened vertically. However, due to the different natural gas tables in different regions, the details may be different. You are advised to read the instructions carefully or consult your local natural gas company.